1. Added capability (via constructor) to repack tensor data into a different packed symmetric layout without doing the normal symmetrization permutations that happen during sum
2. Fixed bug associated with C[ij]=A[ij]*B[ijkl] where C and A are SY and B is fully NS.
3. Getting (2) to work in parallel required resolving a bug associated with desymmetrization (in the two unfold_broken_Sym functions), which were changing symmetry without changing sym_table, and as a result yielding extra mapping restrictions.
The bug fix to (3) might improve performance generally.
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